PCS lists Marco Haller and Reto Hollenstein as current leaders with 81 days this year. Hollenstein is planning to go to Deutschland-Tour which puts him to 85 at finish. And actually Backaert would go from 80 to 86 in Deutschland-Tour and two one-day races.
De Gendt would also go over in the Vuelta so I don't believe to that rule.
Maybe you're allowed to go over if you go over while participating in a (stage) race.